From: Christophe TROESTLER <Christophe.Troestler+ocaml@umh.ac.be>
To: dmitry.bely@gmail.com
Cc: caml-list@inria.fr
Subject: Re: [Caml-list] Re: Question about float refs.
Date: Wed, 01 Sep 2010 09:46:07 +0200 (CEST) [thread overview]
Message-ID: <20100901.094607.1753910472605096940.Christophe.Troestler+ocaml@umons.ac.be> (raw)
In-Reply-To: <AANLkTimWwzasrCYA2FHg+Kn_CN_yLBerWRDsSyqBrYgT@mail.gmail.com>
On Wed, 1 Sep 2010 11:18:05 +0400, Dmitry Bely wrote:
>
> >> Some black magic is needed:
> >>
> >> let r = ref 0.0 in
> >> for i = 0 to 1000_000_000 do r := float i done;
> >> Printf.printf "%f\n" (!r +. 0.);
> >> Printf.printf "words: %f\n" (Gc.stat ()).Gc.minor_words
>
> Do you have any idea why the optimizer needs that?
It helps the compiler to figure out that “r” must be unboxed.
See also http://caml.inria.fr/mantis/view.php?id=5133
C.
next prev parent reply other threads:[~2010-09-01 7:46 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-19 11:52 Ethan Burns
2010-08-19 13:14 ` [Caml-list] " Lukasz Stafiniak
2010-08-19 13:34 ` David House
2010-08-19 13:49 ` Till Varoquaux
2010-08-23 12:06 ` Christophe TROESTLER
2010-08-23 12:14 ` Ethan Burns
2010-08-23 12:42 ` Sylvain Le Gall
2010-08-23 13:00 ` [Caml-list] " Dmitry Bely
2010-08-31 19:41 ` Jon Harrop
2010-09-01 7:18 ` Dmitry Bely
2010-09-01 7:46 ` Christophe TROESTLER [this message]
2010-09-01 8:31 ` Fabrice Le Fessant
2010-09-01 9:54 ` Ethan Burns
2010-09-01 12:29 ` Fabrice Le Fessant
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